Based on test and analysis of defluorination mechanism in production of feedgrade phosphate by single superphosphate method, the technological measures with raising phosphorus concentration (P 2O 5≥100 g/L)in leach liquor and controlling defluorination endpoint(pH=2.

Study on reducing moisture of superphosphate by pulping waste liquor;

Affecting factors and its variation rules on extrusion granulation of urea-superphosphate granular com pound fertilizer are studied.

The application and economical profit of a new type of mixing reaciton plant for producing calcium superphosphate;

In this paper,a new type of mixing reaction unit composed of injector and baffled chamber,which is used in production of calcium superphosphate

A numerical calculation for the conversion rate of calcium superphosphate products was derived by the a-nalysis of factors on the conversion rate,and a method for the determination of ratio of phosphate ore incomplete decomposi-tion and available phesphate degeneration induced by sesquioxide was put forward,which provided a path for the predictionand adjustment of the process system.

Potassium dihydrogen phosphate was prepared by the reaction of ordinary superphosphate with potassium sulfate,and effecting factors were investigated.

The paper report discussess the method in which extract directly available phosphorus from granular triple superphosphate and superphosphate with neutral ammonium citric acid.